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Impact of caffeine on test performance

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Dr. Hernandez wants to examine the impact of caffeine on test performance. She randomly assigns the 60 students in her class to three groups (no caffeine-placebo, 100mg of caffeine, 200mg of caffeine) and then 40 minutes later students take a test. What kind of study is this?

a. A quasi-experimental study

b. A correlational study

c. An experimental study

d. A regression-based study

e. A lab based observational cross sectional study

Reference no: EM131818446

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